REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday, 1 April 2019

COLOR TV CIRCUIT DIAGRAM - USING IC TDA935X/6X/8X - SYSCON CHROMA JUNGLE

COLOR TV CIRCUIT DIAGRAM - USING IC TDA935X/6X/8X - SYSCON CHROMA Jungle

ICs used: TDA935X/6X/8X_AT24C08_TDA7449_TDA8356/N6_TDA7057AQ_STR-G5653/F6654_HEF4053_TDQ-5B6M (Tuner) [Service Mode]
The super chips TDA935X/6X/8X are good in pins compatibility. Differences among them are shown as follows.
TDA9351（48K）PAL/NTSC/SECAM+1 PAGE TELETEST
TDA9350（48K）PAL/NTSC+1 PAGE TELETEST
TDA9361（64K）PAL/NTSC/SECAM+10 PAGE TELETEST
TDA9360（64K）PAL/NTSC+10 PAGE TELETEST
TDA9380（32K）PAL/NTSC
TDA9387（32K）NTSC
The various versions of theTDA935X/6X/8X PS/N2 series combine the functions of a TV signal processor together with a Controller and US Closed Caption decoder. Most versions have a Teletext decoder on board. The Teletext decoder has an internal RAM memory for 1or 10 page text. The ICs are intended to be used in economy television receivers with 90 and 110 picture tubes. The ICs have supply voltages of 8 V and 3.3 V and they are mounted in S-DIP envelope with 64 pins.
CIRCUIT DIAGRAM_Full
PWB_MAIN
PWB_CRT
CLICK ON THE PICTURES TO MAGNIFY 
Supply Voltage Adjustment
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to the rated voltage.
Make sure that the supply voltage is within the range of the rated value.
Connect a digital voltmeter to the +B voltage output terminal of the TV set. Power on the TV and set the brightness and sub-brightness to minimum.
Regulate voltage adjustment components on the power PCB to make the voltmeter read 115±1V.
SERVICE MODE
* Set the volume to 0.
* Then press and hold the MUTE button on the remote control, and press the MENU button on the TV to enter the SERVICE mode. (In this case, the S mode cannot be stored in the EEPROM.  * To exit from the S mode, turn off the TV set)
* After entering the S mode, Red “S”is displayed on the upper centre of the screen and MENU-1 is default. Use the POS+/- buttons to highlight an adjustment and the VOL+/- buttons to adjust it. The adjusted data are immediately output and stored in the EEPROM.
* To write in logo, use the ▲/▼ ↑buttons to highlight an adjustment and the ◄/► buttons to adjust.
Caution: The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing. As the control data have dramatic effects on functions and performance of the TV, service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings.
Posted By: FRANK at 02:28
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